Novel skid-mounted refueling station boil-off gas (BOG) liquefaction system

一种新型撬装式加气站bog液化系统

Abstract

The invention discloses a novel skid-mounted refueling station boil-off gas (BOG) liquefaction system. The system comprises an open-type self-circulation liquefaction cycle and a mixed refrigerant liquefaction cycle, wherein the open-type self-circulation liquefaction cycle is composed of a BOG compressor, a BOG control valve, a liquefied natural gas (LNG) low-temperature pump, an LNG and BOG mixer and an LNG storage tank; the mixed refrigerant liquefaction cycle is composed of a BOG liquefaction module and a mixed refrigerant circulation module, and the mixed refrigerant circulation module comprises two compressors, two condensers, three throttling devices, two gas-liquid separators and three LNG heat exchangers; when the super-cooling degree of LNG in the LNG storage tank is larger than 3 DEG C, only the open-type self-circulation liquefaction cycle is started and used by the system; and when the super-cooling degree of LNG in the LNG storage tank is smaller than 3 DEG C, only the mixed refrigerant liquefaction cycle is stared and used. The novel skid-mounted refueling station BOG liquefaction system is simple in procedure, low in energy consumption, quick in starting, high in forming of skid mounting performance and convenient to maintain and install, the two cycles in the system can adapt to different LNG working conditioner, and the application and popularization value is high.
本发明公开了一种新型撬装式加气站BOG液化系统,该系统包括:开式自循环液化循环和混合制冷剂液化循环;其中开式自循环液化循环由BOG压缩机、BOG控制阀门、LNG低温泵、LNG和BOG混合器、LNG储罐组成,混合制冷剂液化循环由BOG液化模块、混合制冷剂循环模块组成,混合制冷剂循环模块共包括两个压缩机、两个冷凝器、三个节流装置、两个气液分离器和三个LNG换热器;当LNG储罐中LNG的过冷度大于3℃时,系统只启用开式自循环液化循环,当LNG过冷度小于3℃时,只启用混合制冷剂液化循环。本发明中的撬装式加气站BOG液化系统流程简单、能耗低、启动快、成撬性强、维护及安装方便,系统中的两个循环能适应不同LNG工况,推广应用价值高。

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